[quietbritishjim]

> People who point out things can be done without them, who largely see them as useless due to lack of familiarity

There's no need to dismiss the those who disagree as just having a lack of familiarity. There is a technical trade off to be made, with pros and cons each way. The only people that are objectively wrong are those that claim the decision is clear cut.

The con, in particular, is language complexity. You only have to look at C++ to see that it is possible to include to many features in a language. There's no disputing that tail calls are useful. The question is whether they are so useful that everyone who learns the language has to understand them.